skins/common/preview.js

   1 // Live preview
   2
   3 function openXMLHttpRequest() {
   4         if( window.XMLHttpRequest ) {
   5                 return new XMLHttpRequest();
   6         } else if( window.ActiveXObject && navigator.platform != 'MacPPC' ) {
   7                 // IE/Mac has an ActiveXObject but it doesn't work.
   8                 return new ActiveXObject("Microsoft.XMLHTTP");
   9         } else {
  10                 return null;
  11         }
  12 }
  13
  14 /**
  15  * Returns true if could open the request,
  16  * false otherwise (eg no browser support).
  17  */
  18 function livePreview(target, text, postUrl) {
  19         prevTarget = target;
  20         if( !target ) {
  21                 window.alert('crash and burn');
  22         }
  23         prevReq = openXMLHttpRequest();
  24         if( !prevReq ) return false;
  25
  26         prevReq.onreadystatechange = updatePreviewText;
  27         prevReq.open("POST", postUrl, true);
  28
  29         var postData = 'wpTextbox1=' + encodeURIComponent(text);
  30         prevReq.setRequestHeader("Content-Type", "application/x-www-form-urlencoded");
  31         prevReq.send(postData);
  32         return true;
  33 }
  34
  35 function updatePreviewText() {
  36         if( prevReq.readyState != 4 ) {
  37                 return;
  38         }
  39         if( prevReq.status != 200 ) {
  40                 window.alert('Failed to connect: ' + prevReq.status +
  41                         ' "' + prevReq.statusText + '"');
  42                 return;
  43         }
  44         prevTarget.innerHTML = prevReq.responseText;
  45 }